JP2018202170A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which retains a skin surface condition after absorbing liquid, and suppresses skin irritation.SOLUTION: An absorbent article comprises an absorber which includes: water-absorbing resin particles (P) having a crosslinked polymer (A) having as indispensable constituting units, a water soluble vinyl monomer (a1) and/or a vinyl monomer (a2) to be a water soluble vinyl monomer (a1) by hydrolysis, and a crosslinking agent (b); a liquid diffusion member (B); bacteria (D); and a nonionic surface active agent (E). A manufacturing method of the absorbent article includes applying or spraying the bacteria (D) and the nonionic surface active agent (E) to the surface of the liquid diffusion member (B) prior to constituting the absorber.SELECTED DRAWING: None

Description

  The present invention relates to an absorbent article. More specifically, children's disposable diapers, adult disposable diapers, napkins, medical blood retention agents, pet sheets, panty liners, incontinence pads, sweat-absorbing sheets, medical blood absorbent articles, wound protection materials, wound healing agents, and surgical waste liquids The present invention relates to an absorbent article used for a treatment agent or the like.

  Absorbent articles having an aqueous liquid absorber in which cross-linked polymer particles such as water-absorbent resin particles and hydrophilic fibers such as pulp are mixed, and a tissue or a nonwoven fabric on the upper surface of the aqueous liquid absorber are widely known. (For example, refer to Patent Document 1). The absorbent article having such a structure has an excellent absorption capacity, but during actual use, the surface of the absorbent article wet with excrement etc. adheres to the skin for a long time, so that the skin surface is stuffy, There has been a problem that the growth of Staphylococcus aureus and acne bacteria on the skin surface causes skin rash and the like.

  In order to suppress the growth of skin staphylococci and acne bacteria when using absorbent articles, there is a technique for suppressing the growth of bacteria using an antibacterial agent (see, for example, Patent Document 1).

International Publication No. 2008/001444

  However, in the conventional method, since the growth of bacteria such as staphylococcus aureus that promotes metabolism on the skin is also suppressed, the barrier function of the skin is lowered, and the effect of suppressing rough skin is not sufficient.

  The objective of this invention is providing the absorbent article which maintains the surface state of skin after liquid absorption and suppresses skin irritation.

The present invention provides a water-soluble vinyl monomer (a1) and / or a crosslinked polymer (A) having a vinyl monomer (a2) that becomes a water-soluble vinyl monomer (a1) by hydrolysis and a crosslinking agent (b) as essential constituent units. A water absorbent resin particle (P), a liquid diffusing member (B), a bacterium (D), and a nonionic surfactant (E), wherein the bacterium (D) is a genus Lactobacillus or Enterococcus An absorptive article comprising at least one bacterium selected from the group consisting of Lactococcus, Pediococcus, Leuconostoc, Streptococcus, Bifidobacterium, and Staphylococcus epidermidis.
The present invention also relates to a method for producing the above absorbent article, in which the bacteria (D) and the nonionic surfactant (E) are applied or sprayed on the surface of the liquid diffusion member (B) in advance before the absorbent body is formed. This is a method for producing the absorbent article.

  In the absorbent article of the present invention, the surfactant and bacteria come into contact with the skin by using bacteria (D) and nonionic surfactant (E) as essential constituents in the above-described structure, in particular, the absorbent body. By preventing the increase of acne bacteria and Staphylococcus aureus that cause skin inflammation, the surface condition of the skin can be maintained and skin irritation can be suppressed.

The absorbent article of the present invention is a water-soluble vinyl monomer (a1) and / or a vinyl monomer (a2) that becomes a water-soluble vinyl monomer (a1) by hydrolysis (hereinafter also referred to as hydrolyzable vinyl monomer (a2)). And a water-absorbing resin particle (P) having a crosslinked polymer (A) having a crosslinking agent (b) as an essential constituent unit, and an absorber containing the liquid diffusion member (B), And further contains bacteria (D) and nonionic surfactant (E).

In the absorbent article of the present invention, as described above, a composition containing the water absorbent resin particles (P) and the liquid diffusion member (B) is referred to as an absorber.
In the present invention, the absorber is a part that absorbs an aqueous liquid, and examples of the aqueous liquid include body fluids such as urine, sweat, and blood.

  The crosslinked polymer (A) possessed by the water-absorbent resin particles (P) comprises the water-soluble vinyl monomer (a1) and / or the hydrolyzable vinyl monomer (a2) and the crosslinking agent (b) as essential constituent units.

  The water-soluble vinyl monomer (a1) in the present invention is not particularly limited, and is a known monomer, for example, at least one water-soluble substituent group disclosed in Japanese Patent No. 3648553, paragraphs 0007 to 0023 and an ethylenic group. Vinyl monomers having a saturated group (for example, anionic vinyl monomers, nonionic vinyl monomers, and cationic vinyl monomers), anionic vinyl monomers disclosed in paragraphs 0009 to 0024 of JP-A No. 2003-165883, nonionic Selected from the group consisting of a carboxylic group, a sulfo group, a phosphono group, a hydroxyl group, a carbamoyl group, an amino group and an ammonio group disclosed in paragraphs 0041 to 0051 of JP-A-2005-75982 At least one kind Vinyl monomers can be used.

  The hydrolyzable vinyl monomer (a2) is not particularly limited, and known {for example, at least one hydrolyzable substituent that becomes a water-soluble substituent by hydrolysis disclosed in paragraphs 0024 to 0025 of Japanese Patent No. 3648553. A vinyl monomer having at least one hydrolyzable substituent [1,3-oxo-2-oxapropylene (—CO—O—CO—) disclosed in paragraphs 0052 to 0055 of JP-A-2005-75982. ), A vinyl monomer having a group such as an acyl group and a cyano group]. The water-soluble vinyl monomer is a concept well known to those skilled in the art, but when expressed in terms of quantity, for example, it means a vinyl monomer that dissolves in 100 g of water at 25 ° C. The hydrolyzability in the hydrolyzable vinyl monomer (a2) is a concept well known to those skilled in the art. More specifically, for example, it can be expressed by the action of water and, if necessary, a catalyst (acid or base). It means the property of being hydrolyzed to become water-soluble. Hydrolysis of the hydrolyzable vinyl monomer (a2) may be performed either during polymerization, after polymerization, or both of them, but from the viewpoint of the absorption performance of the resulting water-absorbent resin particles, it is preferably after polymerization.

  Among these, the water-soluble vinyl monomer (a1) is preferable from the viewpoint of absorption performance and the like, more preferably the above-mentioned anionic vinyl monomer, carboxy (salt) group, sulfo (salt) group, amino group, carbamoyl group, Vinyl monomers having an ammonio group or a mono-, di- or tri-alkylammonio group, more preferred are vinyl monomers having a carboxy (salt) group or a carbamoyl group, particularly preferred are (meth) acrylic acid (salt) and (Meth) acrylamide, particularly preferred is (meth) acrylic acid (salt), and most preferred is acrylic acid (salt).

The “carboxy (salt) group” means “carboxy group” or “carboxylate group”, and the “sulfo (salt) group” means “sulfo group” or “sulfonate group”. Moreover, (meth) acrylic acid (salt) means acrylic acid, acrylate, methacrylic acid or methacrylate, and (meth) acrylamide means acrylamide or methacrylamide. Examples of the salt include alkali metal (such as lithium, sodium and potassium) salts, alkaline earth metal (such as magnesium and calcium) salts and ammonium (NH ₄ ) salt. Among these salts, alkali metal salts and ammonium salts are preferable from the viewpoint of absorption performance and the like, more preferable are alkali metal salts, and particularly preferable are sodium salts.

  When either the water-soluble vinyl monomer (a1) or the hydrolyzable vinyl monomer (a2) is used as a structural unit, one kind of each may be used alone as a structural unit, and if necessary, two or more kinds may be used as a structural unit. good. The same applies when the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are used as constituent units. Further, when the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are used as structural units, the molar ratio [(a1) / (a2)] is preferably 75/25 to 99/1. The ratio is more preferably 85/15 to 95/5, particularly preferably 90/10 to 93/7, and most preferably 91/9 to 92/8. Within this range, the absorption performance is further improved.

  As a structural unit of the crosslinked polymer (A), in addition to the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2), other vinyl monomers (a3) copolymerizable therewith are used as the structural unit. Can do. Other vinyl monomers (a3) may be used alone or in combination of two or more.

Other vinyl monomers (a3) that can be copolymerized are not particularly limited, and are known (for example, hydrophobic vinyl monomers disclosed in paragraphs 0028 to 0029 of Japanese Patent No. 3648553, Japanese Patent Laid-Open No. 2003-165883). 0025 paragraph and vinyl monomer disclosed in JP-A-2005-75982, paragraph 0058) can be used. Specifically, for example, the following vinyl monomers (i) to (iii) Can be used.
(I) C8-C30 aromatic ethylenic monomer Styrene such as styrene, α-methylstyrene, vinyltoluene and hydroxystyrene, and halogen substituted products of styrene such as vinylnaphthalene and dichlorostyrene.
(Ii) C2-C20 aliphatic ethylenic monomer alkene (ethylene, propylene, butene, isobutylene, pentene, heptene, diisobutylene, octene, dodecene, octadecene, etc.); and alkadiene (butadiene, isoprene, etc.).
(Iii) C5-C15 alicyclic ethylenic monomer Monoethylenically unsaturated monomer (such as pinene, limonene and indene) and polyethylene vinyl monomer [such as cyclopentadiene, bicyclopentadiene and ethylidene norbornene].

  The content (mol%) of the other vinyl monomer (a3) unit is based on the total number of moles of the water-soluble vinyl monomer (a1) unit and hydrolyzable vinyl monomer (a2) unit from the viewpoint of absorption performance and the like. 0 to 5 is preferable, more preferably 0 to 3, particularly preferably 0 to 2, particularly preferably 0 to 1.5. From the viewpoint of absorption performance and the like, the content of other vinyl monomer (a3) units is Most preferably, it is 0 mol%.

  The cross-linking agent (b) is not particularly limited and is known (for example, it reacts with a cross-linking agent having two or more ethylenically unsaturated groups and water-soluble substituents disclosed in paragraphs 0031 to 0034 of Japanese Patent No. 3648553. Crosslinking agent having at least one functional group and at least one ethylenically unsaturated group, and crosslinking agent having at least two functional groups capable of reacting with a water-soluble substituent, Japanese Patent Application Laid-Open No. 2003-165883 The crosslinking agent having two or more ethylenically unsaturated groups, the crosslinking agent having an ethylenically unsaturated group and a reactive functional group, and the crosslinking agent having two or more reactive substituents disclosed in paragraphs 0028 to 0031 of , A crosslinkable vinyl monomer disclosed in paragraph 0059 of JP-A-2005-75982, and paragraphs 0015 to 0016 of JP-A-2005-95759. Crosslinking agents such as disclosed crosslinkable vinyl monomer) can be used. Among these, from the viewpoint of absorption performance and the like, a crosslinking agent having two or more ethylenically unsaturated groups is preferable, and more preferable is triallyl cyanurate, triallyl isocyanurate, and a poly (poly (2 to 40 carbons) polyol). Meta) allyl ethers, particularly preferred are triallyl cyanurate, triallyl isocyanurate, tetraallyloxyethane, polyethylene glycol diallyl ether and pentaerythritol triallyl ether, most preferred is pentaerythritol triallyl ether. A crosslinking agent (b) may be used individually by 1 type, or may use 2 or more types together.

  The content (mol%) of the crosslinking agent (b) unit is (a1) when other vinyl monomers (a3) of the water-soluble vinyl monomer (a1) unit and the hydrolyzable vinyl monomer (a2) unit are also used. Based on the total number of moles of (a3), 0.001 to 5 is preferable, 0.005 to 3 is more preferable, and 0.01 to 1 is particularly preferable. Within this range, the absorption performance is further improved.

  As a polymerization method of the crosslinked polymer (A), known solution polymerization (adiabatic polymerization, thin film polymerization, spray polymerization method, etc .; Japanese Patent Laid-Open No. 55-133413, etc.), and known reverse phase suspension polymerization (Japanese Patent Publication) 54-30710, JP-A-56-26909, and JP-A-1-5808).

  The crosslinked polymer (A) is obtained by polymerizing a monomer composition containing water-soluble vinyl monomer (a1) and / or hydrolyzable vinyl monomer (a2) and crosslinking agent (b) as essential components. Can do. Of the polymerization methods, it is not necessary to use an organic solvent or the like, and is advantageous in terms of production cost. Therefore, the solution polymerization method is preferable, and from the viewpoint of entanglement with the liquid diffusion member (B), more preferably an aqueous solution polymerization method and This is a reverse phase suspension polymerization method.

When aqueous solution polymerization is performed, a mixed solvent containing water and an organic solvent can be used. Examples of the organic solvent include methanol, ethanol, acetone, methyl ethyl ketone, N, N-dimethylformamide, dimethyl sulfoxide, and two or more of these. A mixture of
When aqueous solution polymerization is performed, the amount (% by weight) of the organic solvent used is preferably 40 or less, more preferably 30 or less, based on the weight of water.

In the case of using an initiator for polymerization, conventionally known initiators for radical polymerization can be used. For example, azo compounds [azobisisobutyronitrile, azobiscyanovaleric acid and 2,2′-azobis (2-amidinopropane) Hydrochloride, etc.], inorganic peroxides (hydrogen peroxide, ammonium persulfate, potassium persulfate, sodium persulfate, etc.), organic peroxides [benzoyl peroxide, di-t-butyl peroxide, cumene hydroperoxide, succinate Acid peroxide and di (2-ethoxyethyl) peroxydicarbonate, etc.] and redox catalyst (alkali metal sulfite or bisulfite, ammonium sulfite, ammonium bisulfite, ascorbic acid and the like, and alkali metal persulfate) Such as salt, ammonium persulfate, hydrogen peroxide and organic peroxide And those comprising a combination with an oxidizing agent). These catalysts may be used alone or in combination of two or more thereof.
The amount (% by weight) of the radical polymerization initiator used is (a1) to (a3) when other vinyl monomers (a3) of the water-soluble vinyl monomer (a1) and the hydrolyzable vinyl monomer (a2) are also used. Based on the total weight, 0.0005 to 5 is preferable, and 0.001 to 2 is more preferable.

At the time of polymerization, a polymerization control agent typified by a chain transfer agent may be used as necessary. Specific examples thereof include sodium hypophosphite, sodium phosphite, alkyl mercaptans, alkyl halides. And thiocarbonyl compounds. These polymerization control agents may be used alone or in combination of two or more thereof.
The amount (% by weight) of the polymerization control agent used is (a1) to (a3) when the water-soluble vinyl monomer (a1) and other vinyl monomers (a3) of the hydrolyzable vinyl monomer (a2) are also used. Based on the total weight, 0.0005 to 5 is preferable, and 0.001 to 2 is more preferable.

  When a suspension polymerization method or a reverse phase suspension polymerization method is used as the polymerization method, the polymerization may be carried out in the presence of a dispersant or a surfactant as necessary. In the case of the reverse phase suspension polymerization method, polymerization can be carried out using a hydrocarbon solvent such as xylene, normal hexane and normal heptane.

  The polymerization start temperature can be appropriately adjusted depending on the type of catalyst used, but is preferably 0 to 100 ° C, more preferably 2 to 80 ° C.

  When using a solvent (such as an organic solvent and water) for the polymerization, the solvent is preferably distilled off after the polymerization. When the solvent contains an organic solvent, the content (% by weight) of the organic solvent after distillation is preferably 0 to 10, more preferably 0 to 5, particularly preferably based on the weight of the crosslinked polymer (A). Is 0-3, most preferably 0-1. Within this range, the absorption performance of the water-absorbent resin particles is further improved.

  When water is contained in the solvent, the water content (% by weight) after distillation is preferably 0 to 20, more preferably 1 to 10, particularly preferably 2 to 9, based on the weight of the crosslinked polymer (A). Most preferably, it is 3-8. Within this range, the absorption performance is further improved.

By the above polymerization method, the crosslinked polymer (A) can contain a water-containing gel-like product (that is, a crosslinked polymer (A) that is a water-containing gel-like product, hereinafter abbreviated as a water-containing gel). Furthermore, the dried crosslinked polymer (A) can be obtained by drying the hydrogel.
When an acid group-containing monomer such as acrylic acid or methacrylic acid is used as the water-soluble vinyl monomer (a1), the hydrogel may be neutralized with a base. The neutralization degree of the acid group is preferably 50 to 80 mol%. When the degree of neutralization is less than 50 mol%, the resulting water-containing gel polymer has high tackiness, and the workability during production and use may deteriorate. Furthermore, the water retention amount of the water-absorbing resin particles obtained may decrease. On the other hand, when the degree of neutralization exceeds 80%, the pH of the obtained resin becomes high, and there is a concern that the safety of human skin may be concerned.
The neutralization may be performed at any stage after the polymerization of the crosslinked polymer (A) in the production of the water-absorbent resin particles. For example, a method such as neutralization in the state of a hydrogel is preferable. Illustrated.
As the base to be neutralized, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and alkali metal carbonates such as sodium carbonate, sodium hydrogen carbonate and potassium carbonate can be usually used.

  The hydrogel obtained by polymerization can be shredded as necessary. The size (longest diameter) of the gel after chopping is preferably 50 μm to 10 cm, more preferably 100 μm to 2 cm, and particularly preferably 1 mm to 1 cm. Within this range, the drying property in the drying process is further improved.

  Shredding can be performed by a known method, and can be shredded using a normal shredding device {for example, a Bex mill, rubber chopper, pharma mill, mincing machine, impact crusher, and roll crusher}. .

  As a method of distilling off the solvent (including water), a method of distilling (drying) with hot air at a temperature of 80 to 230 ° C., a thin film drying method using a drum dryer heated to 100 to 230 ° C., (heating ) Vacuum drying, freeze drying, infrared drying, decantation, filtration, etc. can be applied.

  The water-containing gel can be dried to obtain a crosslinked polymer (A), and then pulverized after drying. The pulverizing method is not particularly limited, and a normal pulverizing apparatus {for example, a hammer-type pulverizer, an impact-type pulverizer, a roll-type pulverizer, and a shet airflow-type pulverizer} can be used. The pulverized crosslinked polymer can be adjusted in particle size by sieving or the like, if necessary.

  The weight average particle size (μm) of the crosslinked polymer (A) when screened as necessary is preferably 100 to 800, more preferably 200 to 700, next preferably 250 to 600, particularly preferably 300 to 500, Most preferably, it is 350-450. Within this range, the absorption performance is further improved and the entanglement with the liquid diffusion member (B) is also improved.

  The weight average particle size was measured using a low tap test sieve shaker and a standard sieve (JIS Z8801-1: 2006), Perry's Chemical Engineers Handbook, 6th edition (Mac Glow Hill Book, 1984). , Page 21). That is, JIS standard sieves are combined in the order of 1000 μm, 850 μm, 710 μm, 500 μm, 425 μm, 355 μm, 250 μm, 150 μm, 125 μm, 75 μm and 45 μm, and a tray from the top. About 50 g of the measured particles are put in the uppermost screen and shaken for 5 minutes with a low-tap test sieve shaker. Weigh the measured particles on each sieve and the pan, and calculate the weight fraction of the particles on each sieve with the total as 100% by weight. This value is the logarithmic probability paper {the horizontal axis is the sieve aperture (particle size ), The vertical axis is plotted in the weight fraction}, a line connecting the points is drawn, and the particle diameter corresponding to the weight fraction of 50% by weight is obtained, and this is defined as the weight average particle diameter.

  Further, when pulverized, the smaller the content of the fine particles contained in the crosslinked polymer (A) after pulverization, the better the absorption performance. Therefore, 106 μm or less (preferably 150 μm) of the total weight of the crosslinked polymer (A). The content (% by weight) of the following fine particles is preferably 3 or less, more preferably 1 or less. The content of the fine particles can be determined using a graph created when determining the above-mentioned weight average particle diameter.

  When pulverized, the shape of the crosslinked polymer (A) after pulverization is not particularly limited, and examples thereof include an irregularly crushed shape, a flake shape, a pearl shape, and a rice grain shape. Among these, from the viewpoint of good entanglement with the liquid diffusing member (B) and no fear of dropping from the fibrous material, the irregularly crushed shape is preferable.

  The crosslinked polymer (A) may contain some other components such as a residual solvent and a residual crosslinking component as long as the performance is not impaired.

  The crosslinked polymer (A) preferably contains a hydrophobic substance (g) from the viewpoint of surface modification and liquid permeability.

  As the hydrophobic substance (g), a hydrophobic substance (g1) containing a hydrocarbon group, a hydrophobic substance (g2) containing a hydrocarbon group having a fluorine atom, and a hydrophobic substance (g3) having a polysiloxane structure Etc. are included.

  Hydrophobic substances (g1) containing hydrocarbon groups include polyolefin resins, polyolefin resin derivatives, polystyrene resins, polystyrene resin derivatives, waxes, long chain fatty acid esters, long chain fatty acids and salts thereof, long chain aliphatic alcohols, long Chain aliphatic amides and mixtures of two or more thereof are included.

  As the polyolefin resin, an olefin having 2 to 4 carbon atoms {ethylene, propylene, isobutylene, isoprene, etc.} as an essential constituent monomer (the olefin content is at least 50% by weight based on the weight of the polyolefin resin) And polymers having an average molecular weight of 1,000 to 1,000,000 {for example, polyethylene, polypropylene, polyisobutylene, poly (ethylene-isobutylene), isoprene, etc.}.

  Examples of the polyolefin resin derivative include polymers having a weight average molecular weight of 1,000 to 1,000,000 introduced by introducing a carboxyl group (—COOH), 1,3-oxo-2-oxapropylene (—COOCO—) or the like into a polyolefin resin {for example, polyethylene heat Degradation, polypropylene thermal degradation, maleic acid modified polyethylene, chlorinated polyethylene, maleic acid modified polypropylene, ethylene-acrylic acid copolymer, ethylene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, maleation Polybutadiene, ethylene-vinyl acetate copolymer, and maleated product of ethylene-vinyl acetate copolymer}.

  As the polystyrene resin, a polymer having a weight average molecular weight of 1,000 to 1,000,000 can be used.

  As the polystyrene resin derivative, a polymer having a weight average molecular weight of 1,000 to 1,000,000 (for example, styrene-containing styrene as an essential constituent monomer (the content of styrene is at least 50% by weight based on the weight of the polystyrene derivative)). Maleic anhydride copolymer, styrene-butadiene copolymer, styrene-isobutylene copolymer, etc.}.

  Examples of the wax include waxes having a melting point of 50 to 200 ° C. (for example, paraffin wax, beeswax, carbana wax, beef tallow, etc.).

  As long-chain fatty acid esters, esters of fatty acids having 8 to 30 carbon atoms and alcohols having 1 to 12 carbon atoms {for example, methyl laurate, ethyl laurate, methyl stearate, ethyl stearate, methyl oleate, oleic acid Ethyl, glycerin lauric acid monoester, glycerin stearic acid monoester, glycerin oleic acid monoester, pentaerythritol lauric acid monoester, pentaerythritol stearate monoester, pentaerythritol oleic acid monoester, sorbit lauric acid monoester, Sorbit stearic acid monoester, sorbit oleic acid monoester, sucrose palmitic acid monoester, sucrose palmitic acid diester, sucrose palmitic acid triester, sucrose stearic acid monoester Ester, sucrose stearic acid diester, sucrose stearic acid triester, and beef tallow} and the like.

  Examples of long chain fatty acids and salts thereof include fatty acids having 8 to 30 carbon atoms (for example, lauric acid, palmitic acid, stearic acid, oleic acid, dimer acid, behenic acid, etc.), and salts thereof include zinc, calcium, Examples thereof include salts with magnesium or aluminum (hereinafter abbreviated as Zn, Ca, Mg, Al, respectively) {for example, palmitic acid Ca, palmitic acid Al, stearic acid Ca, stearic acid Mg, stearic acid Al, etc.}.

  Examples of the long-chain aliphatic alcohol include aliphatic alcohols having 8 to 30 carbon atoms (for example, lauryl alcohol, palmityl alcohol, stearyl alcohol, oleyl alcohol, etc.). From the viewpoint of the moisture resistance of the absorbent article, palmityl alcohol, stearyl alcohol, and oleyl alcohol are preferable, and stearyl alcohol is more preferable.

As the long chain aliphatic amide, a long chain aliphatic primary amine having 8 to 30 carbon atoms and 1 to 30 carbon atoms.
An amidation product of a carboxylic acid having a hydrocarbon group, ammonia or an amidation product of a primary amine having 1 to 7 carbon atoms and a long chain fatty acid having 8 to 30 carbon atoms, or an aliphatic chain having 8 to 30 carbon atoms. An amidated product of one long-chain aliphatic secondary amine and a carboxylic acid having 1 to 30 carbon atoms, a secondary amine having two aliphatic hydrocarbon groups having 1 to 7 carbon atoms, and a length having 8 to 30 carbon atoms Examples include amidated products with chain fatty acids.

  As an amidation product of a long-chain aliphatic primary amine having 8 to 30 carbon atoms and a carboxylic acid having a hydrocarbon group having 1 to 30 carbon atoms, a product obtained by reacting a primary amine and a carboxylic acid 1: 1 is used. : Divided into those reacted in 2. Examples of the product reacted at 1: 1 include acetic acid N-octylamide, acetic acid N-hexacosylamide, heptacosanoic acid N-octylamide, heptacosanoic acid N-hexacosylamide, and the like. Examples of those reacted at 1: 2 include diacetate N-octylamide, diacetate N-hexacosylamide, diheptacosanoic acid N-octylamide, and diheptacosanoic acid N-hexacosylamide. In the case where the primary amine and the carboxylic acid are reacted at 1: 2, the carboxylic acid used may be the same or different.

  As an amidation product of ammonia or a primary amine having 1 to 7 carbon atoms and a long chain fatty acid having 8 to 30 carbon atoms, ammonia or a primary amine and a carboxylic acid reacted in 1: 1 and 1: 2 Divided into reacted products. The products reacted at 1: 1 include nonanoic acid amide, nonanoic acid methylamide, nonanoic acid N-heptylamide, heptacosanoic acid amide, heptacosanoic acid N-methylamide, heptacosanoic acid N-heptylamide and heptacosanoic acid N-hexacosylamide Etc. The ones reacted in 1: 2 were dinonanoic acid amide, dinonanoic acid N-methylamide, dinonanoic acid N-heptylamide, dioctadecanoic acid amide, dioctadecanoic acid N-ethylamide, dioctadecanoic acid N-heptylamide, diheptacosanoic acid amide. And diheptacosanoic acid N-methylamide, diheptacosanoic acid N-heptylamide, and diheptacosanoic acid N-hexacosylamide. In addition, as a thing which ammonia or primary amine and carboxylic acid reacted by 1: 2, the carboxylic acid to be used may be the same or different.

  Examples of the amidated product of a long-chain aliphatic secondary amine having at least one aliphatic chain having 8 to 30 carbon atoms and a carboxylic acid having 1 to 30 carbon atoms include N-methyloctylamide acetate, N-methylhexacoxy acetate Luamide, acetic acid N-octylhexacosylamide, acetic acid N-dihexacosylamide, heptacosanoic acid N-methyloctylamide, heptacosanoic acid N-methylhexacosylamide, heptacosanoic acid N-octylhexacosylamide and heptacosane Examples include acid N-dihexacosylamide.

  Examples of amidated products of secondary amines having two aliphatic hydrocarbon groups having 1 to 7 carbon atoms and long chain fatty acids having 8 to 30 carbon atoms include nonanoic acid N-dimethylamide, nonanoic acid N-methylheptylamide, Nonanoic acid N-diheptylamide, heptacosanoic acid N-dimethylamide, heptacosanoic acid N-methylheptylamide, heptacosanoic acid N-diheptylamide and the like can be mentioned.

  Examples of the hydrophobic substance (g2) containing a hydrocarbon group having a fluorine atom include perfluoroalkane, perfluoroalkene, perfluoroaryl, perfluoroalkyl ether, perfluoroalkyl carboxylic acid, perfluoroalkyl alcohol, and those 2 A mixture of seeds or more is included.

Examples of the hydrophobic substance (g3) having a polysiloxane structure include polydimethylsiloxane, polyether-modified polysiloxane {polyoxyethylene-modified polysiloxane and poly (oxyethylene / oxypropylene) -modified polysiloxane, etc.}, carboxy-modified polysiloxane, Epoxy-modified polysiloxane, amino-modified polysiloxane, alkoxy-modified polysiloxane and the like, and mixtures thereof are included.

  The HLB value of the hydrophobic substance (g) is preferably 1 to 10, more preferably 2 to 8, particularly preferably 3 to 7. Within this range, the moisture resistance of the absorbent article is further improved. The HLB value means a hydrophilic-hydrophobic balance (HLB) value, and is determined by the Oda method (new introduction to surfactants, page 197, Takehiko Fujimoto, Sanyo Chemical Industries, Ltd., published in 1981). .

  Of the hydrophobic substance (g), a hydrophobic substance (g1) containing a hydrocarbon group is preferable from the viewpoint of the moisture resistance of the absorbent article, more preferably a long-chain fatty acid ester, a long-chain fatty acid and a salt thereof, Long chain aliphatic alcohols and long chain aliphatic amides, more preferably sorbite stearate, sucrose stearate, stearic acid, Mg stearate, Ca stearate, Zn stearate and Al stearate, particularly preferably Sucrose stearate and Mg stearate, most preferably sucrose stearate monoester.

  The water-absorbent resin particles of the present invention preferably have a structure in which the surface of the crosslinked polymer (A) is crosslinked by the surface crosslinking agent (d). By crosslinking the surface of the crosslinked polymer (A), the gel strength of the water-absorbent resin particles can be improved, and the desired water retention amount and the amount of absorption under load of the water-absorbent resin particles can be satisfied. Examples of the surface cross-linking agent (d) include known polyvalent glycidyl compounds, polyvalent amines, polyvalent aziridine compounds and polyvalent isocyanate compounds described in JP 59-189103 A, JP 58-180233 A. And polyhydric alcohols described in JP-A-61-16903, silane coupling agents described in JP-A-61-211305 and JP-A-61-252212, and JP-A-5-508425. Use is made of a surface crosslinking agent or the like of an alkylene carbonate, a polyvalent oxazoline compound described in JP-A-11-240959, and a polyvalent metal described in JP-A-51-136588 and JP-A-61-257235) it can. Of these surface cross-linking agents, from the viewpoint of economy and absorption properties, polyvalent glycidyl compounds, polyhydric alcohols and polyhydric amines are preferred, polyvalent glycidyl compounds and polyhydric alcohols are more preferred, and many are particularly preferred. Valent glycidyl compounds, most preferred are ethylene glycol diglycidyl ethers. A surface crosslinking agent may be used individually by 1 type, and may use 2 or more types together.

  In the case of surface cross-linking, the amount (% by weight) of the surface cross-linking agent is not particularly limited because it can be changed variously depending on the type of surface cross-linking agent, the conditions for cross-linking, the target performance, etc. From a viewpoint etc., 0.001-3 are preferable with respect to 100 weight part of crosslinked polymers (A), More preferably, it is 0.005-2, Most preferably, it is 0.01-1.5.

  Surface crosslinking of the crosslinked polymer (A) can be performed by mixing the crosslinked polymer (A) and the surface crosslinking agent (d) and heating as necessary. As a mixing method of the crosslinked polymer (A) and the surface crosslinking agent (d), a cylindrical mixer, a screw mixer, a screw extruder, a turbulator, a nauter mixer, a double arm kneader, a flow Cross-linked polymer using a mixing device such as a mixing mixer, a V-type mixer, a minced mixer, a ribbon-type mixer, a fluid-type mixer, an airflow-type mixer, a rotating disk-type mixer, a conical blender, and a roll mixer. A method of uniformly mixing A) and the surface cross-linking agent (d) can be mentioned. At this time, the surface crosslinking agent (d) may be used after diluted with water and / or an arbitrary solvent.

  Although the temperature at the time of mixing a crosslinked polymer (A) and a surface crosslinking agent (d) is not specifically limited, 10-150 degreeC is preferable, More preferably, it is 20-100 degreeC, Most preferably, it is 25-80 degreeC. .

  After mixing the cross-linked polymer (A) and the surface cross-linking agent (d), heat treatment is performed. The heating temperature is preferably 100 to 180 ° C., more preferably 110 to 175 ° C., and particularly preferably 120 to 170 ° C. from the viewpoint of breakage resistance of the resin particles. Heating at 180 ° C. or lower is advantageous in terms of equipment because indirect heating using steam is possible, and absorption performance may deteriorate at heating temperatures below 100 ° C. Moreover, although heating time can be suitably set with heating temperature, from a viewpoint of absorption performance, Preferably it is 5 to 60 minutes, More preferably, it is 10 to 40 minutes. The water-absorbing resin obtained by surface cross-linking can be further surface cross-linked using the same or different type of surface cross-linking agent as the first used surface cross-linking agent.

  After the surface of the crosslinked polymer (A) is crosslinked with the surface crosslinking agent (d), the particle size is adjusted by sieving as necessary. The average particle size of the obtained particles is preferably 100 to 600 μm, more preferably 200 to 500 μm. The content of fine particles is preferably small, the content of particles of 100 μm or less is preferably 3% by weight or less, and the content of particles of 150 μm or less is more preferably 3% by weight or less.

  The water-absorbent resin particles (P) may contain bacteria (D) and a surfactant (E) described later. Bacteria (D) diffuses with the aqueous liquid when in contact with the aqueous liquid, and the diffused bacteria come into contact with the skin to prevent the increase of acne and Staphylococcus aureus that cause skin inflammation. It is assumed that it is excellent in maintaining the surface state.

  Examples of bacteria (D) include Lactobacillus, Enterococcus, Lactococcus, Pediococcus, Leuconostoc, Streptococcus, Bifidobacterium, and Staphylococcus epidermidis. From the viewpoint of being a fungus, Staphylococcus epidermidis belonging to the genus Lactobacillus, Enterococcus, Lactococcus, Bifidobacterium and Staphylococcus is preferred.

  The content of bacteria (D) in the water-absorbent resin particles (P) can be adjusted according to the application of the water-absorbent resin particles. The content is preferably 0001 to 100% by weight, more preferably 0.01 to 50% by weight, still more preferably 0.01 to 10% by weight, and particularly preferably 0.1 to 10% by weight. Within this range, an increase in acne bacteria and Staphylococcus aureus that cause skin inflammation can be prevented, which is more preferable.

  The nonionic surfactant (E) can be used in combination with the bacterium (D) to prevent the dried cells from falling off from the absorber before use. Nonionic surfactants include water-soluble polymers having a number average molecular weight of 2,000 to 200,000 (polyalkylene (alkylene having 2 to 4 carbon atoms) glycol, carboxymethyl cellulose, etc.), and polyoxyethylene nonylphenyl ether (poly). Oxyalkylene (alkylene group having 2 to 4 carbon atoms, degree of polymerization: 1 to 100) alkyl (1 to 22 carbon atoms) phenyl ether; higher alcohol such as polyoxyethylene lauryl ether and polyoxyethylene myristyl ether (8 to 8 carbon atoms) 24) (poly) oxyalkylene (alkylene group carbon number: 2 to 4, polymerization degree: 1 to 100) ether; type such as ethylene oxide adduct of polypropylene glycol, etc.] May be. Among these, (poly) oxyalkylene (carbon number of alkylene group: 2 to 4, polymerization degree: 1 to 100) ether of higher alcohol (carbon number 8 to 24) and pluronic type nonionic surfactant are preferable.

The content of the nonionic surfactant (E) in the water absorbent resin particles (P) can be adjusted according to the use of the water absorbent resin particles, but the crosslinked polymer (A) and the nonionic surfactant (E )) To 0.001 to 1.0% by weight, and more preferably 0.001 to 0.1% by weight. Within this range, an increase in acne bacteria and Staphylococcus aureus that cause skin inflammation can be prevented, which is more preferable.

  The water-absorbent resin particles can be obtained by mixing the crosslinked polymer (A), bacteria (D), and nonionic surfactant (E). As a method for mixing bacteria (D), cylindrical mixer, screw mixer, screw extruder, turbulator, nauter mixer, double-arm kneader, fluid mixer, V mixer, mince Examples of the method include uniform mixing using a known mixing device such as a mixer, a ribbon mixer, a fluid mixer, an airflow mixer, a rotating disk mixer, a conical blender, and a roll mixer.

Mixing the crosslinked polymer (A) with the bacteria (D) and the nonionic surfactant (E) may add the bacteria (D) and the nonionic surfactant (E) to the crosslinked polymer (A) under stirring. preferable. The added bacteria (D) and surfactant (E) may be added simultaneously with water and / or solvent.
When adding bacteria (D) simultaneously with water and / or solvent, it is preferable to add a dispersion in which bacteria (D) and nonionic surfactant (E) are dispersed in water and / or solvent. It is more preferable to add a dispersion dispersed in water from the viewpoint. When the dispersion is added, it is preferably added by spraying or dropping.

  Although the temperature at the time of mixing a crosslinked polymer (A), bacteria (D), and nonionic surfactant (E) is not specifically limited, 10-60 degreeC is preferable, More preferably, it is 20-50 degreeC, Most preferably, it is 25. ~ 40 ° C.

You may heat-process, after mixing a crosslinked polymer (A), bacteria (D), and nonionic surfactant (E). The heating temperature is preferably 25 to 60 ° C. from the viewpoint of heat resistance of bacteria. Moreover, when not heating, the water and solvent used together will remain excessively in the water-absorbent resin, and the absorption performance may deteriorate.
In the case of heating after mixing the crosslinked polymer (A) with the bacteria (D) and the nonionic surfactant (E), the heating time can be appropriately set depending on the heating temperature, but preferably 5 from the viewpoint of absorption performance. -60 minutes, more preferably 10-40 minutes.

  The content of the bacteria (D) and the nonionic surfactant (E) in the water absorbent resin particles (P) can be adjusted according to the use of the water absorbent resin particles, but the crosslinked polymer (A) and bacteria Based on the total weight of (D) and the nonionic surfactant (E), it is preferably 0.01 to 5% by weight, more preferably 0.1 to 3% by weight. Within this range, the water permeability of the water-absorbent resin particles is good, which is more preferable.

The surface of the water absorbent resin particles (P) can be further coated with an inorganic powder. Examples of preferable inorganic powders include glass, silica gel, silica sol, silica, clay, carbon fiber, kaolin, talc, mica, bentonite, sericite, asbestos, and shirasu. Of the inorganic powders, silica sol, silica and talc are preferable.
The shape of the inorganic powder may be any of an irregular shape (crushed shape), a true spherical shape, a film shape, a rod shape, and a fiber shape, but an amorphous shape (crushed shape) or a true spherical shape is preferred, and a true spherical shape is more preferred. .

  The content (% by weight) of the inorganic powder is preferably 0.01 to 3.0, more preferably 0.05 to 1.0, and then preferably 0.00 based on the weight of the crosslinked polymer (A). It is 07 to 0.8, particularly preferably 0.10 to 0.6, and most preferably 0.15 to 0.5. Within this range, the anti-fogging property of the absorbent article is further improved.

For the water absorbent resin particles (P), other additives {for example, known (Japanese Patent Laid-Open No. 2003-225565).
Preservatives, fungicides, antibacterial agents, antioxidants, ultraviolet absorbers, colorants, fragrances, deodorants, organic fibrous materials, etc. . When these additives are contained, the content (% by weight) of the additives is preferably 0.001 to 10, more preferably 0.01 to 5, particularly preferably based on the weight of the crosslinked polymer (A). Preferably it is 0.05 to 1, most preferably 0.1 to 0.5.

The water-absorbent resin particles (P) are crosslinked polymer particles that absorb 40 times their own weight physiological saline in 40 to 150 seconds, more preferably 55 to 120 seconds, and particularly preferably 65 to 110 seconds. preferable.
Within this range, the anti-fogging property of the absorbent article is further improved. By adjusting the content of the hydrophobic substance (g), the average particle diameter and the apparent density of the crosslinked polymer to the above preferred ranges, the absorption time of physiological saline can be adjusted to the preferred range, and the crosslinked polymer particles (A) By adjusting the apparent density and the weight average particle diameter of the crosslinked polymer particles to the above-mentioned preferable range, it can be adjusted to a more preferable range.
The physiological saline absorption time is a time measured by the following method in a room of 25 ± 2 ° C. and a humidity of 50 ± 10%. The physiological saline temperature to be used is adjusted to 25 ° C. ± 2 ° C. in advance.

<Measurement of physiological saline absorption time>
1.00 g of a measurement sample is put into a 100 ml beaker, and 40 g of physiological saline (saline concentration: 0.9% by weight) is added. It is allowed to stand without stirring, and the time until the physiological saline is completely absorbed (the beaker is slightly tilted at the end of water absorption to check the liquid residue) is taken as the absorption time (t1). The temperature of the physiological saline used and the measurement atmosphere is 25 ° C. ± 2 ° C.

  The water retention amount (g / g) of the water-absorbent resin particles (P) is preferably 25 to 60, more preferably 26 to 55, and particularly preferably 27 to 50, from the viewpoint of anti-fogging property of the absorbent article. The water retention amount of the crosslinked polymer particles is measured by the following method.

<Measurement method of water retention amount of water absorbent resin particles (P)>
1.00 g of a measurement sample is put into a tea bag (20 cm long, 10 cm wide) made of a nylon net having a mesh size of 63 μm (JIS Z8801-1: 2006), and 1,000 ml of physiological saline (saline concentration 0.9% by weight). After soaking for 1 hour without stirring, hang for 15 minutes and drain. Thereafter, each tea bag is placed in a centrifuge, centrifuged at 150 G for 90 seconds to remove excess physiological saline, and the weight (h1) including the tea bag is measured to obtain the water retention amount from the following equation.
Water retention amount (g / g) = (h1)-(h2)
The temperature of the physiological saline used and the measurement atmosphere is 25 ° C. ± 2 ° C. The weight of the tea bag after centrifugal dehydration is measured (h2) in the same manner as above except that no measurement sample is used.

In the absorbent body of the absorbent article of the present invention, the liquid diffusion member (B) is a member for diffusing the absorbed liquid, and examples thereof include hydrophilic fibers and synthetic fibers. Examples of hydrophilic fibers include hydrophilic fibers {raw materials (conifers and hardwoods, etc.) used in absorbent articles, such as various fluff pulps and cotton-like pulps, and production methods [chemical pulps, semi-chemical pulps and chemi-thermomechanics] Pulp (CTMP) etc.], bleaching method} and sheet-like materials such as tissue are not particularly limited. Synthetic fibers can be used alone or in combination with the above fluff pulp, cotton-like pulp or the like, and may be formed into a non-woven sheet. Examples of synthetic fibers include polyolefin fibers (polyethylene fibers and polypropylene fibers, etc.), polyester fibers (polyethylene terephthalate fibers, etc.), polyolefin / polyester composite fibers, polyamide fibers, and polyacrylonitrile fibers.

  The length and thickness of the hydrophilic fiber are not particularly limited, and usually, the length is preferably 1 to 200 mm and the thickness is preferably 0.1 to 100 denier (0.11 to 110 dtex). The shape is not particularly limited as long as it is fibrous, and examples thereof include a web shape, a thin cylindrical shape, a cut split yarn shape, a staple shape, and a filament shape.

In the absorbent body of the absorbent article of the present invention, the water absorbent resin particles (P) and the liquid diffusion member (B) may be mixed uniformly, or one of them may be unevenly distributed.
The water absorbent resin particles (P) can be applied to various absorbent bodies to produce an absorbent article having excellent absorption performance. The absorbent body is composed of water-absorbent resin particles (P) and hydrophilic fibers or synthetic fibers that are the liquid diffusion member (B), and (1) hydrophilicity composed of pulp or the like arranged in layers. Form in which water-absorbent resin particles (P) are dispersed between fibers or synthetic fiber layers; (2) hydrophilic fibers or synthetic fibers made of pulp, heat-fusible fibers, etc. and water-absorbent resin particles (P) Mixed form: (3) A form in which the water-absorbent resin particles (P) are sandwiched with hydrophilic fibers as necessary with two or more water-absorbent papers and nonwoven fabrics.

  The addition amount of the water-absorbent resin particles (P) of the present invention to the absorber can be variously changed according to the type and size of the absorber and the target absorption performance. It is preferably 10 to 95% by weight, more preferably 30 to 95% by weight, and particularly preferably 50 to 95% by weight based on the total mass of the conductive fiber and the synthetic fiber. Within this range, the absorbent capacity of the resulting absorber tends to be even better.

  In order to enhance the shape retention before and during use of the absorbent body, the fibers may be bonded together by adding an adhesive binder. Examples of such an adhesive binder include a heat-fusable synthetic fiber, a hot melt adhesive, and an adhesive emulsion.

  Examples of the heat-fusible synthetic fiber include a fully-fused binder such as polyethylene, polypropylene, and ethylene-propylene copolymer, and a non-fully-fused binder composed of side-by-side and core-sheath structures of polypropylene and polyethylene. In the above-mentioned non-total melting type binder, only the polyethylene portion is thermally fused.

  Examples of hot melt adhesives include base polymers such as ethylene-vinyl acetate copolymer, styrene-isoprene-styrene block copolymer, styrene-butadiene-styrene block copolymer, and amorphous polypropylene, and tackifiers, plasticizers, and antioxidants. And the like.

  Examples of the adhesive emulsion include a polymer of at least one monomer selected from the group consisting of methyl methacrylate, styrene, acrylonitrile, 2-ethylhexyl acrylate, butyl acrylate, butadiene, ethylene, and vinyl acetate. It is done. These adhesive binders may be used alone or in combination of two or more.

  The absorbent body in the absorbent article of the present invention preferably contains bacteria (D) at a site through which the liquid passes. The bacteria (D) may be in contact with the skin during water absorption, and may not be in contact with the skin before water absorption. From the viewpoint of preventing the bacteria (D) from falling off, the bacteria (D) are preferably contained in the absorbent body before water absorption, and applied to tissues, nonwoven fabrics, water absorbent resin particles, hydrophilic fibers, and synthetic fibers. It is more preferable to keep it.

  Bacteria (D) can obtain liquid diffusion member (B) containing bacteria (D) by making liquid diffusion member (B) and bacteria (D) contact. Preferably, it is obtained by removing water after bringing the bacterium (D) -containing aqueous dispersion and the liquid diffusible member (B) into contact with each other. Thus, by mixing bacteria (D), bacteria (D) are taken in the liquid diffusible member (B) surface or inside. Preferably, at least the surface of the liquid diffusing member (B) is adhered to the surface, and more preferably, the majority is adhered to the surface.

  It does not specifically limit as a method of making a liquid diffusable member (B) and a bacteria (D) containing aqueous dispersion contact. A method of immersing the liquid diffusible member (B) in the bacterium (D) -containing aqueous dispersion or the above-mentioned bacterium (D) and nonionic surfactant (E) -containing aqueous dispersion is dropped on the surface of the liquid diffusible member (B). The method of apply | coating, spraying, etc. are mentioned. Thus, it is preferable to apply or spray bacteria (D) on the surface of the liquid diffusion member (B) in advance before constituting the absorber. Note that a known method can be used as a method for forming the absorber. For example, the absorber can be manufactured by a known manufacturing method (Japanese Patent Laid-Open Nos. 2013-255565, 2014-233447, and 2003-225565). No. 2006, No. 2006-131767 and No. 2005-097569).

  The concentration of bacteria (D) in the aqueous dispersion containing bacteria (D) and nonionic surfactant (E) is preferably 0.001 to 5.0 mass%, more preferably 0.01 to 3.0 mass%, More preferably, it is 0.01-1.0. When soaking, the lower the concentration of the dispersion, the easier it is to add, and when applying or spraying, the higher the concentration of the dispersion, the shorter the drying time.

  The concentration of nonionic surfactant (E) in the aqueous dispersion containing bacteria (D) and nonionic surfactant (E) is preferably 0.001 to 10.0% by mass, more preferably 0.005 to 5.0. It is 0.01 mass%, More preferably, it is 0.01-5.0 mass%. When soaking, the lower the concentration of the dispersion, the easier it is to add, and when applying or spraying, the higher the concentration of the dispersion, the shorter the drying time.

  In the present invention, the content of bacteria (D) is preferably 0.001 to 10% by mass, more preferably 0 based on the total weight of the liquid diffusion member (B) from the viewpoint of prevention of bacteria falling off and absorption performance. 0.001 to 3% by mass, particularly preferably 0.001 to 1% by mass.

  Water in the case of contact as an aqueous dispersion may be removed, or may be used as it is without being removed. The method for removing water is not particularly limited. For example, after bringing the bacteria (D) of the present invention into contact with the liquid diffusible member (B) in an appropriate amount, the water is removed by squeezing, centrifugal dehydration, heating and drying. The heating temperature is preferably 15 to 60 ° C, more preferably 20 to 50 ° C. The heating and drying time is preferably 15 minutes or more by blowing air at a temperature close to room temperature from the viewpoint of suppressing coloring, and more preferably 1 hour or more. If the drying time is 1 hour or more, it will be in a dry state to the extent that there is no problem in actual use.

  In the absorbent article of the present invention, the absorbent body is characterized by diffusing bacteria (D) during absorption of an aqueous liquid, thereby suppressing an increase in the cause of skin inflammation and suppressing skin inflammation.

  As the absorbent article, an absorbent article including an absorbent body, a liquid permeable sheet, and a breathable back sheet is preferable, and an absorbent article as a sanitary article is more preferable. Hygiene products include paper diapers (children's disposable diapers and adult disposable diapers, etc.), napkins (such as sanitary napkins), paper towels, pads (such as incontinence pads and surgical underpads), and pet sheets (pet urine absorbing sheets). Etc. Of these hygiene articles, they are more suitable for disposable diapers. Known structures and manufacturing methods of these absorbent articles can be applied.

  For example, an absorbent article such as a sanitary napkin or a disposable paper diaper can be configured by sandwiching the above-described absorbent body between a liquid-permeable sheet and a liquid-impermeable sheet.

  Examples of the material of the liquid-permeable sheet include a nonwoven fabric made of polyolefin such as polyethylene and polypropylene, polyester, polyamide, polyurethane, and a porous synthetic resin film.

  Examples of the material of the liquid-impermeable sheet include synthetic resin films made of polyethylene, polypropylene, ethylene vinyl acetate, and polyvinyl chloride, films made of composite materials of these synthetic resins and nonwoven fabrics, and the above-described synthetic resins And a film made of a composite material of woven fabric and fabric. This liquid-impermeable sheet may have a property of transmitting vapor.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited to these. Hereinafter, unless otherwise specified, “%” represents “% by weight” and “parts” represents “parts by weight”.

<Example of production of crosslinked polymer particles>
<Production Example 1>
Water-soluble vinyl monomer (a1) {acrylic acid} 155 parts (2.15 mole parts), crosslinking agent (b) {pentaerythritol triallyl ether} 0.6225 parts (0.0024 mole parts) and deionized water 340. 27 parts were kept at 3 ° C. with stirring and mixing. Nitrogen was introduced into the mixture to reduce the dissolved oxygen amount to 1 ppm or less, and then 0.62 part of 1% aqueous hydrogen peroxide solution, 1.1625 part of 2% aqueous ascorbic acid solution and 2% 2,2′-azobis [ 2.325 parts of 2-methyl-N- (2-hydroxyethyl) -propionamide] aqueous solution was added and mixed to initiate polymerization. After the temperature of the mixture reached 90 ° C., polymerization was carried out at 90 ± 2 ° C. for about 5 hours to obtain a hydrogel (1).

  Next, 128.42 parts of 48.5% aqueous sodium hydroxide solution was added and mixed while shredding 502.27 parts of this hydrogel (1) with a mincing machine, followed by hydrophobic substance (g) {Mg stearate } 1.9 parts was added and mixed to obtain a chopped gel (2). Further, the chopped gel (2) was dried with a ventilation band dryer {150 ° C., wind speed 2 m / sec} to obtain a dried product. After the dried product was pulverized with a juicer mixer, dried product particles were obtained by adjusting the particle size to 150 to 710 μm using a sieve having 150, 300, 500, 600, and 710 μm openings. While stirring 100 parts of the dry particles at a high speed, 5 parts of a 2% water / methanol mixed solution of ethylene glycol diglycidyl ether (water / methanol weight ratio = 70/30) was added while being sprayed and mixed. It left still at 30 degreeC and surface-crosslinked, and the water absorbent resin particle (P-1) was obtained. The water-absorbent resin particles (P-1) had a weight average particle diameter of 400 μm and an apparent density of 0.58 g / ml. The weight average particle diameter and the apparent density were measured by the following methods.

<Measurement of weight average particle diameter>
Standard sieves having openings of 1000 μm, 850 μm, 710 μm, 500 μm, 425 μm, 355 μm, 250 μm, 150 μm, 125 μm, 75 μm and 45 μm were sequentially stacked and combined on the saucer. About 50 g of the water-absorbent resin particles were put on the uppermost screen and shaken for 5 minutes with a low-tap test sieve shaker. The weight of the particles remaining on each sieve and the saucer is weighed, and the total weight is 100% by weight to obtain the weight fraction of the particles on each sieve. This value is logarithmic probability paper {the horizontal axis is the sieve opening ( (Particle diameter), the vertical axis is plotted as weight fraction}, then a line connecting the points is drawn to determine the particle diameter corresponding to the weight fraction of 50% by weight, and this is defined as the weight average particle diameter.

<Measurement of apparent density>
It measured based on JISK7365: 1999 in 25 degreeC environment.

<Production Example 2>
“Adjust to 150-710 μm particle size using sieves with 150,300,500,600,710 μm openings” “Adjust 150 to 500 μm particle size using 150, 300,500 μm sieves” The water-absorbent resin particles (P-2) were obtained in the same manner as in Production Example 1 except that the product was changed to "". The weight average particle diameter of the water absorbent resin particles (P-2) measured in the same manner as in Production Example 1 was 300 μm, and the apparent density was 0.66 g / ml.

<Production Example 3>
Water-absorbent resin particles (P-3) were obtained in the same manner as in Production Example 1, except that the hydrophobic substance (g) was not used. The weight average particle diameter of the water-absorbent resin particles (P-3) measured in the same manner as in Production Example 1 was 400 μm, and the apparent density was 0.64 g / ml.

<Production Example 4>
145.4 parts of acrylic acid was diluted with 9.4 parts of water and neutralized by adding 242.3 parts of 25% aqueous sodium hydroxide while cooling to 30-20 ° C. To this solution, 0.09 part of ethylene glycol diglycidyl ether, 0.0146 part of sodium hypophosphite monohydrate and 0.0727 part of potassium persulfate were added and dissolved, and a biomixer (Nippon Seiki Co., Ltd.) was added at 25 ° C. A monomer aqueous solution was obtained by stirring and dispersing for 2 minutes using ABM-2 manufactured by the company.

  Next, 624 parts of cyclohexane was placed in a reaction vessel equipped with a stirrer, a reflux condenser, a thermometer, and a nitrogen gas introduction tube, and polyoxyethylene octylphenyl ether phosphate (Daiichi Kogyo Seiyaku Co., Ltd., Commodity) (Name: Prisurf A210G) 1.56 parts was added and dissolved, and then purged with nitrogen while stirring, and the temperature was raised to 70 ° C. Then, the monomer aqueous solution was dropped at 6.6 parts / min for 6 minutes while being kept at 70 ° C. and held at 75 ° C. for 15 minutes, and then the remaining monomer aqueous solution was kept at 6.6 parts / min for 54 minutes. It was dripped. Then, after aging at 75 ° C. for 30 minutes, the water content of the resin is about 20% by azeotroping water with cyclohexane (infrared moisture meter: FD-100 type, manufactured by Kett, measured at 180 ° C. for 20 minutes). Removed until When the water-absorbing absorbent resin particles settled when cooled to 30 ° C. and agitated, the absorbent resin particles and the cyclohexane layer were separated by decantation, filtered, and dried under reduced pressure at 80 ° C. Particles were obtained. While 100 parts of the dried particles were stirred at high speed (high speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm), 0.06 part of ethylene glycol diglycidyl ether as a surface crosslinking agent (d) and 0.42 of methanol were added thereto. And a mixed solution in which 0.18 parts of ion-exchanged water were mixed and uniformly mixed, and then heated at 135 ° C. for 30 minutes to obtain surface-crosslinked water-absorbent resin particles (P-4). The weight average particle diameter of the water absorbent resin particles (P-4) measured in the same manner as in Production Example 1 was 320 μm, and the apparent density was 0.50 g / ml.

<Production Example 5>
100 parts of the water-absorbent resin particles (P-1) obtained in Production Example 1 were freeze-dried and 0.1 parts of Lactobacillus bulgaricus with high-speed stirring (high-speed stirring turbulizer manufactured by Hosokawa Micron: rotation speed 2000 rpm). , 0.5 part of PEG / PPG-150 / 35 copolymer (New Pole PE-78 (manufactured by Sanyo Chemical Industries)) was added and mixed uniformly. The mixture was heated at 60 ° C. for 90 minutes to obtain water absorbent resin particles (P-5).

<Production Example 6>
In Production Example 5, “0.1 part of Lactobacillus bulgaricus” is changed to “0.01 part of Lactobacillus acidophilus”, “PEG / PPG-150 / 35 copolymer (New Pole PE-78; Sanyo Chemical Industries Ltd.) The same operation as in Production Example 5 was carried out except that 0.5 part "(manufactured by company) was changed to" 0.5 part sorbitan stearate (Ionette S-60V; manufactured by Sanyo Chemical Industries Ltd.) ", and water absorbent resin particles (P-6) was obtained.

<Production Example 7>
In Production Example 5, “water absorbent resin particles (P-1)” is changed to “water absorbent resin particles (P-2)”, “0.01 part of Lactobacillus acidophilus” is “Enterococcus faecalis 0” Except for changing to ".0002 parts", the same operation as in Production Example 6 was performed to obtain water absorbent resin particles (P-7).

<Production Example 8>
In Production Example 5, “0.1 part of Lactobacillus bulgaricus” is changed to “0.2 part of Enterococcus faecium” and “PEG / PPG-150 / 35 copolymer (New Pole PE-78; manufactured by Sanyo Chemical Industries, Ltd.) ) 0.5 parts "was changed to" glyceryl stearate (Ionet TG-C; manufactured by Sanyo Chemical Industries, Ltd.) 0.5 part ", and the same operation as in Production Example 5 was performed to obtain water-absorbing resin particles (P -8) was obtained.

<Production Example 9>
In Production Example 5, “water-absorbent resin particles (P-1)” was changed to “water-absorbent resin particles (P-4)”, and “Lactobacillus bulgaricus 0.1 part” was changed to “staphylococcus Epidermidis 0.025 part "and" PEG / PPG-150 / 35 copolymer (New Pole PE-78; manufactured by Sanyo Chemical Industries Co., Ltd.) 0.5 part "" Polysorbate 80 (manufactured by Sanyo Chemical Industries Co., Ltd.) 0. Except having changed to "5 parts", operation similar to manufacture example 5 was performed and the water absorbing resin particle (P-9) was obtained.

<Production Example 10>
In Production Example 5, “Lactobacillus bulgaricus 0.1 part” is changed to “Bifidobacterium bifidum 0.4 part”, “PEG / PPG-150 / 35 copolymer (New Pole PE-78; Sanyo Chemical Industries, Ltd.) The same operation as in Production Example 5 was carried out except that 0.5 part "was changed to 0.5 part" Sucrose polyether polyol (New Paul HS; Sanyo Chemical Industries, Ltd.) " Resin particles (P-10) were obtained.

<Production Example 11>
In Production Example 5, “Lactobacillus bulgaricus 0.1 part” is changed to “Staphylococcus haemolyticus 1.0 part” and “PEG / PPG-150 / 35 copolymer (New Pole PE-78; Sanyo Chemical Industries Ltd.) The same operation as in Production Example 5 was performed except that 0.5 part "(manufactured by company) was changed to" 0.5 part octyl glucoside (manufactured by Sigma-Aldrich) "to obtain water-absorbing resin particles (P-11).

<Production Example 12>
In Production Example 5, the same operation as in Production Example 5 was carried out except that “Lactobacillus bulgaricus 0.1 part” was changed to “Lactobacillus bulgaricus 100 part”, and water absorbent resin particles (P-12) Got.

<Production Example 13>
In Production Example 5, the same operation as in Production Example 5 was carried out except that “Lactobacillus bulgaricus 0.1 part” was changed to “Lactobacillus bulgaricus 75 part”, and water absorbent resin particles (P-13) Got.

<Production Example 14>
In Production Example 5, the same operation as in Production Example 5 was carried out except that “Lactobacillus bulgaricus 0.1 part” was changed to “Lactobacillus bulgaricus 50 part”, and water absorbent resin particles (P-14) Got.

<Production Example 15>
In Production Example 5, the same operation as in Production Example 5 was carried out except that “Lactobacillus bulgaricus 0.1 part” was changed to “Lactobacillus bulgaricus 10 part”, and water absorbent resin particles (P-15) Got.

<Comparative Production Example 1>
The water absorbent resin particles (P-1) obtained in Production Example 1 were directly used as comparative water absorbent resin particles (R-1).

  As performance evaluation results for the water-absorbent resin particles (P-1) to (P-15) of Production Examples 1 to 12 and the water-absorbent resin (R-1) of Comparative Production Example 1, physiological saline 40 times its own weight The absorption time [physiological saline (40 times) absorption time] and the water retention amount were measured by the following method and listed in Table 1 together with the weight average particle diameter and the apparent density.

<Measurement of physiological saline (40 times) absorption time>
To each 100 ml beaker containing 1.00 g of water-absorbing resin particles (P), 40 g of physiological saline (salt concentration: 0.9% by weight) was added. Then, leave it unstirred and measure the time until physiological saline is completely absorbed (tilt the beaker slightly at the end of water absorption to check the remaining liquid), and absorb physiological saline (40 times) It was time. The physiological saline used and the temperature of the measurement atmosphere were 25 ° C. ± 2 ° C.

<Measurement of water retention amount>
1.00 g of water-absorbent resin particles (P) is placed in a tea bag (20 cm long, 10 cm wide) made of a nylon net having a mesh size of 63 μm (JIS Z8801-1: 2006), and physiological saline (salt concentration 0.9 weight) %) It was immersed in 1,000 ml for 1 hour without stirring. Then, it was lifted from the physiological saline, hung for 15 minutes to drain, and the tea bag was placed in a centrifuge and centrifuged at 150 G for 90 seconds to remove excess physiological saline. The weight (h1) including the tea bag after dehydration was measured. Further, the weight of the tea bag operated in the same manner except that no crosslinked polymer particles were added was measured (h2), and the water retention amount was determined from the following formula.
Water retention amount (g / g) = (h1)-(h2)
The temperature of the physiological saline used and the measurement atmosphere was 25 ° C. ± 2 ° C.

<Production Example 16>
An aqueous dispersion containing Lactobacillus bulgaricus was prepared. That is, in a 500 mL separable flask, 0.1 part of Lactobacillus bulgaricus, 300 parts of ion-exchanged water, 0.5 part of PEG / PPG-150 / 35 copolymer (New Pole PE-78 (manufactured by Sanyo Chemical Industries)) An aqueous dispersion (S) (solid content concentration 0.2%) containing Lactobacillus bulgaricus was obtained.

<Production Example 17>
Non-woven fabric (b-1) which is a diffusible member (B) {nonwoven fabric basis weight: 25 g / m ² , 2.2T 44-SMK manufactured by Toyobo Co., Ltd.} An aqueous dispersion containing 0.03% by weight Lactobacillus bulgaricus ( S) was sprayed uniformly to 8 g / m ² to obtain a nonwoven fabric (b-5).

<Production Example 18>
An aqueous dispersion containing 0.03% by weight of Lactobacillus bulgaricus in the water permeable sheet (b-2) {weight per unit area 15.5 g / m ² , manufactured by Advantech, filter paper No. 2} as the diffusible member (B) (S) was sprayed uniformly to 8 g / m ² to obtain a water-permeable sheet (b-6).

<Production Example 19>
10 parts of aqueous dispersion (S) containing 0.03% by weight Lactobacillus bulgaricus is uniformly added by spray to 100 parts of hydrophilic fiber (b-3) {fluff pulp} which is the diffusible member (B) A hydrophilic fiber (b-7) was obtained.

<Production Example 20>
Dispersion member (B) “nonwoven fabric (b-4) {nonwoven fabric basis weight: 22 g / m ² , thermal bond nonwoven fabric S2260} manufactured by Havic Co., Ltd.” ”is dispersed in water containing 0.03% by weight Lactobacillus bulgaricus After immersing in "1000 parts of liquid" for 1 hour, the diffusible member (B) was taken out and dried with a circulating dryer at 40 ° C for 1 hour to obtain a nonwoven fabric (b-8).

<Example 1>
Nonwoven fabric (b-1) which is a diffusible member (B) uniformly so that the water absorbent resin particles (P-5) have a basis weight of 200 g / m ² {nonwoven fabric basis weight: 25 g / m ² , 2.2T manufactured by Toyobo Co., Ltd. 44-SMK} by hand, and sprayed with water uniformly at 17.5 g / m ² from above to obtain an absorbent body (1). The absorbent body (1) is cut into a 10 cm × 40 cm rectangle, and the absorbent body (1) is a water-permeable sheet (b-2) which is a diffusive member (B) having the same size as the absorbent body (1). 15.5 g / m ² , Advantech Co., Ltd., filter paper No. 2} was used to obtain an absorbent body (1-1). Furthermore, a polyethylene sheet (polyethylene film UB-1 manufactured by Tamapoly Co., Ltd.) is disposed as the back sheet, and a non-woven fabric (b-1) (non-woven fabric basis weight: 25 g / m ² , 2.2T 44-SMK manufactured by Toyobo Co., Ltd.) is disposed on the outermost surface. By doing so, an absorbent article (1) was prepared.

<Example 2>
In Example 1, “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-1)”, and “nonwoven fabric (b-1)” was “nonwoven fabric (b-5)”. Absorbent article (2) was prepared in the same manner as in Example 1, except that the change was made.

<Example 3>
In Example 1, “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-1)”, and “water permeable sheet (b-2)” was changed to “water permeable sheet (b)”. Absorbent article (3) was prepared in the same manner as in Example 1 except that it was changed to "-6)".

<Example 4>
In Example 1, “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-1)”, and “water 17.5 g / m ² ” was changed to “0.03% by weight lacto. An absorbent article (4) was prepared in the same manner as in Example 1 except that the aqueous dispersion (S) containing Bacillus bulgaricus (S) was changed to 8 g / m ² .

<Example 5>
20 parts of hydrophilic fiber (b-3) {fluff pulp} and 80 parts of water-absorbing resin particles (P-5) were mixed with an airflow mixing device {pad former} to obtain a mixture, and then this mixture Is uniformly laminated on an acrylic plate (thickness 4 mm) so as to have a basis weight of 250 g / m ^2, and water is sprayed uniformly so as to be 17.5 g / m ² from above, and 30 at a pressure of 5 kg / cm ^2. It pressed for 2 seconds and obtained the absorber (2). This absorbent body (2) is cut into a rectangle of 10 cm × 40 cm, and a water-permeable sheet (b-2) having the same size as the absorbent body on the upper and lower sides (weight per unit: 15.5 g / m ² , filter paper manufactured by Advantech) No. 2} was arranged to obtain an absorber (2-1). Further, a polyethylene sheet (polyethylene film UB-1 manufactured by Tamapoly Co., Ltd.) is disposed on the back surface as a back sheet, and a non-woven fabric (b-1) {non-woven fabric basis weight: 25 g / m ² , 2.2T 44-SMK manufactured by Toyobo Co., Ltd.} is disposed on the surface. By doing so, an absorbent article (5) was prepared. The weight ratio of water-absorbing particles to hydrophilic fibers (weight of water-absorbing resin particles / weight of hydrophilic fibers) was 80/20.

<Example 6>
In Example 5, “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-1)”, and “hydrophilic fibers (b-3)” were changed to “hydrophilic fibers (b-3)”. Absorbent article (6) was prepared in the same manner as in Example 5 except that it was changed to "-7)".

<Example 7>
In Example 5, except that “nonwoven fabric (b-1)” was changed to “nonwoven fabric (b-4) {nonwoven fabric basis weight: 22 g / m ² , thermal bond nonwoven fabric S2260} manufactured by Habics Co., Ltd.” Similarly, an absorbent article (7) was prepared.

<Example 8>
In Example 5, “hydrophilic fiber (b-3)” was changed from 20 parts to 50 parts, and “water absorbent resin particles (P-5)” was changed from 80 parts to 50 parts. In the same manner as in Example 5, an absorbent article (8) was prepared.

<Example 9>
In Example 5, “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-1)”, and “water 17.5 g / m ² ” was changed to “0.03% by weight lacto. An absorbent article (9) was prepared in the same manner as in Example 5 except that the aqueous dispersion (S) containing Bacillus bulgaricus (S) was changed to 8 g / m ² .

<Example 10>
An absorbent article (10) was prepared in the same manner as in Example 1, except that "water absorbent resin particles (P-5)" was changed to "water absorbent resin particles (P-6)".

<Example 11>
An absorbent article (11) was prepared in the same manner as in Example 1 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-7)”.

<Example 12>
An absorbent article (12) was prepared in the same manner as in Example 1 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-8)”.

<Example 13>
Other than changing the “water absorbent resin particles (P-5)” to “water absorbent resin particles (P-1)” and changing the water permeable sheet (b-2) to the water permeable sheet (b-6). In the same manner as in Example 5, an absorbent article (13) was prepared.

<Example 14>
“Water absorbent resin particles (P-5)” was changed to “Water absorbent resin particles (P-1)”, Non-woven fabric (b-1) disposed on the outermost surface (nonwoven fabric weight: 25 g / m ² , Toyobo Co., Ltd.) An absorbent article (14) was prepared in the same manner as in Example 5 except that 2.2T 44-SMK (manufactured) was changed to the nonwoven fabric (b-5).

<Example 15>
An absorbent article (15) was prepared in the same manner as in Example 5 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-9)”.

<Example 16>
An absorbent article (16) was prepared in the same manner as in Example 5 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-10)”.

<Example 17>
An absorbent article (17) was prepared in the same manner as in Example 5 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-11)”.

<Example 18>
An absorbent article (18) was prepared in the same manner as in Example 5 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-12)”.

<Example 19>
An absorbent article (19) was prepared in the same manner as in Example 5 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-13)”.

<Example 20>
An absorbent article (20) was prepared in the same manner as in Example 5, except that "water absorbent resin particles (P-5)" was changed to "water absorbent resin particles (P-14)".

<Example 21>
An absorbent article (21) was prepared in the same manner as in Example 5 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (P-15)”.

<Example 22>
“Water absorbent resin particles (P-5)” is changed to “Water absorbent resin particles (P-3)”, “Water permeable sheet (b-2)” is changed to “Water permeable sheet (b-6)” An absorbent article (22) was prepared in the same manner as in Example 5 except for the change.

<Example 23>
An absorbent article (23) was prepared in the same manner as in Example 18, except that "water-permeable sheet (b-6)" was changed to "nonwoven fabric (b-8)".

<Example 24>
“Water absorbent resin particles (P-5)” is changed to “Water absorbent resin particles (P-3)”, “Nonwoven fabric (b-1)” arranged on the outermost surface is “Nonwoven fabric (b-8)” An absorbent article (24) was prepared in the same manner as in Example 5, except that the change was made.

<Comparative Example 1>
A comparative absorbent article (1) was prepared in the same manner as in Example 1 except that the “water absorbent resin particles (P-5)” was changed to “water absorbent resin particles (R-1)”.

  Examples 1 to 24 Absorbent articles (1 to 24) obtained and Comparative absorbent article (1) obtained in Comparative Example 1 were evaluated for rough skin amelioration by the following methods, and the results are shown in Table 2. Described.

<Improves rough skin>
A test was conducted using 5 male employees (aged 25 to 50) using a rough skin model induced with a 5% by mass aqueous sodium lauryl sulfate (SLS) solution.
Two sites of 1.5 cmφ were provided on the inner side of the forearm, and transcutaneously dissipated moisture (TEWL) was measured with “Tevameter TM300” manufactured by Integral. The absorbent articles manufactured in Examples 1 to 20 and Comparative Example 1 were cut to 1.5 cmφ, infiltrated with 1.5 mL of 5% SLS aqueous solution, and attached to the inner side of the forearm where TEWL was measured. The affixed absorbent article was fixed with a medical tape (for example, 3M baby skin surgical tape 50 mm) and peeled off after 4 hours. The same operation was performed for 4 consecutive days (4 hours / day). After 4 days, the absorbent article was peeled off, the skin surface that had been fixed was washed with ion-exchanged water, the skin surface was dried in a room for 30 minutes, and TEWL was measured. The difference between TEWL measured before the test and TEWL measured after the test was defined as “ΔTEWL”, which was used as an index of rough skin. The larger “ΔTEWL”, the more rough the skin is. From the results in Table 2, it can be seen that the absorbent article of the present invention has an effect of preventing or improving rough skin.

  As can be seen from Table 2, the absorbent article of the present invention was excellent in rough skin improvement while maintaining the water absorption of the aqueous liquid as compared with the comparative absorbent article. Therefore, when the absorbent article of the present invention is used, it is easily predicted that it will not cause skin irritation or the like due to skin stuffiness.

Absorbent articles of the present invention include children's disposable diapers, adult disposable diapers, napkins, pet sheets, panty liners, incontinence pads, sweat-absorbing sheets, medical blood absorbent articles, wound protection materials, wound healing agents, surgical waste liquid treatment agents, etc. Useful for.

Claims (6)

  Water-absorbent resin having water-soluble vinyl monomer (a1) and / or crosslinked monomer (a2) which becomes water-soluble vinyl monomer (a1) by hydrolysis and a crosslinked polymer (A) having a crosslinking agent (b) as essential constituent units Particle (P), liquid diffusion member (B), bacteria (D) and an absorbent containing nonionic surfactant (E), wherein the bacteria (D) are Lactobacillus, Enterococcus, Lactococcus, An absorbent article comprising an absorbent body that is at least one bacterium selected from the group consisting of Pediococcus, Leuconostoc, Streptococcus, Bifidobacterium, and Staphylococcus epidermidis.   The absorptivity according to claim 1, wherein the bacterium (D) is at least one bacterium selected from the group consisting of Lactobacillus, Enterococcus, Lactococcus, Bifidobacterium, and Staphylococcus epidermidis. Goods.   The absorptive article according to claim 1 or 2 with which bacteria (D) have adhered to the surface of water-absorbent resin particles (P) and / or liquid diffusion member (B).   The absorbent article according to any one of claims 1 to 3, wherein the content of the bacteria (D) is 0.0001 to 100% by weight based on the weight of the water-absorbent resin particles (P).   Water-absorbent resin having water-soluble vinyl monomer (a1) and / or crosslinked monomer (a2) which becomes water-soluble vinyl monomer (a1) by hydrolysis and a crosslinked polymer (A) having a crosslinking agent (b) as essential constituent units A method for producing an absorbent article comprising an absorbent comprising particles (P), a liquid diffusing member (B) and bacteria (D), wherein the bacteria (D) and nonions are preliminarily formed before the absorbent body is constructed. The manufacturing method of the absorbent article characterized by apply | coating or spraying a surface active agent (E) on the surface of a liquid-diffusion member (B). The production method according to claim 5, wherein the content of the bacteria (D) is 0.0001 to 100% by weight based on the weight of the water-absorbent resin particles (P).